If you're diving into the world of high-performance engines, you know how crucial it is to have reliable components. That's where these ACL Race Series Engine Bearings come into play. Crafted with a unique blend of design, metallurgy, and engineering, these bearings are built to handle those high RPMs that come with pushing your engine to its limits. Whether you’re working on a 4, 6, or 8-cylinder setup, these bearings have got you covered.

Let’s break down what makes these bearings stand out:

• High Strength Overlay: The overlay plate is thinner, which means it offers better fatigue resistance. You want your bearings to hold up when the revs are climbing, right?
• Hardened Steel Backs: All rod bearings feature hardened steel backs. This not only supports the bearing lining but also helps keep everything snug in the housing.
• Increased Crush: With a bit more crush, these bearings stay put, giving you peace of mind when you’re hitting those high speeds.
• No Flash Plating: Forget about flash plating on the back. This design choice helps with heat transfer and ensures a solid grip between the bearings and their housing.
• Increased Eccentricity: This feature compensates for bore distortion at high RPMs and aids in forming those all-important hydrodynamic oil films.
• 3/4 Grooved Main Bearings: This design optimizes the load-carrying surface area and boosts oil flow to the conrod bearings, which is essential for performance.
• Tight Wall Tolerances: Consistent wall tolerances help maintain your clearances, which is vital for engine health.
• Enlarged ID Chamfers: These are included where needed to fit those performance crankshafts with large fillet radii.

Now, let’s talk specifics:

• Sizes Available: STD, .025, .25
• Oil Clearance: Standard
• Half Type: Identical Halves
• Materials: A solid mix of Aluminum, Tin, and Silicon
• Min Standard Shaft Size: 1.888in / 47.956 mm
• Max Standard Shaft Size: 1.8887in / 47.974 mm
• Min Standard Tunnel Size: 2.0079in / 51.000 mm
• Max Standard Tunnel Size: 2.0084in / 51.013 mm
• Max Wall at Crown: 0.0592in / 1.503 mm
• Max Overall Length: 0.673in / 17.10 mm

And here’s where these bearings fit best:

• Nissan NX 1991-1996
• Nissan Pulsar 1987-2005
• Nissan Silvia S15 1999-2002

For those with a Nissan 4 1998cc SR20DE/DET, you’ll want to grab the .50 oversized aluminum rod bearing set from '91 to '98. Trust me, these bearings can make a difference when you're looking to maximize performance.

So, if you’re serious about your engine build, these ACL bearings are worth considering. They’re designed for durability and performance, and they’ll keep you running strong at those higher RPMs.